from rest_framework.response import Response
from rest_framework.views import exception_handler
from django.db import DatabaseError
from rest_framework import status
import logging

# 创建一个日志记录器
logger = logging.getLogger('django')


# 自定义异常处理函数
def custom_exception_handler(exc, context):
    """
        自定义异常处理
        exc: 异常类
        context: 抛出异常的上下文
        return: Response响应对象

        """
    # 调用drf框架原生的异常处理方法
    # exception_handler是drf框架提供的异常处理方法，用于处理各种异常情况，返回一个Response对象
    response = exception_handler(exc, context)

    if response is None:
        view = context['view']

        if isinstance(exc, DatabaseError):
            logger.error('[%s] %s' % (view, exc))
            # 数据库错误
            response = Response({'msg': '服务器繁忙，请稍后再试'}, status=status.HTTP_507_INSUFFICIENT_STORAGE)
        elif isinstance(exc, ZeroDivisionError):
            logger.error('[%s] %s' % (view, exc))
            # 0不能为除数异常
            response = Response({'msg': '0不能作为除数'}, status=status.HTTP_500_INTERNAL_SERVER_ERROR)
    return response
